Refrigerator



April 11, 1939. H. H. BXLER 2,154,299

REFRIGERATOR Filed May 51, 1935 3 Sheets-Sheet l Iverwtor Harley rl.Bxler;

is ttofrey.

April 11, 1939 H. H. BlxLER 2,154,299

REFRIGERATOR Filed May 3l, 1935 3 Sheets-Sheet 2 Figs.

Irlvertor:

Harley Iixler,

His Attorney.

April ll, 1939.

H. H. BIXLER REFRIGERATOR Filed May 3l, 1955 5 Sheets-Sheet 3 Fig.

Inventor. Harley H EJixler';

l-Is Attorney.

Patented Apr. :11, 1939 2,154,299

UNITED STATES PATENT OFFICE BEFRIGEEATOR Harley H. Bixler, Schenectady,N. Y., assignor to General Electric Company, a corporation of New YorkApplication May 31, 1935, Serial No. 24,196

10 Claims. (Cl. 62-116) My invention relates to refrigerators.perishable articles which are particularly sensi- It is frequentlydesirable, especially in domestive to the effects of dehydration.

tic installations, to provide a single refrigerator Further objects andadvantages of my invenhaving separate compartments in which various tionwill become apparent as the following detypes of articles may bepreserved under the parscription proceeds and the features of novelty 5ticular conditions of temperature and humidity which characterize myinvention will be pointed best suited thereto. A freezing compartmentout with particularity in the claims annexed to should be provided inwhich ice cubes, or the and forming a part of this specification. like,may be frozen in suitable trays and in For a better understanding of myinvention.

which meat, and the like, may be preserved at reference may be had tothe accompanying draw- 10 a temperature below 32 F. At least one otherings in which Fig. 1 is a side elevation, partly compartment should beprovided in which vegein section, of a refrigerator embodying myintables and other foods may be preserved at a vention, the top thereofbeing broken away; Fig. temperature above 32 F. and in air of sum- 2 isa detail sectional view of a control valve ciently high humidity toprevent excessive deincluded in the refrigerator shown in Fig. 1; 15hydration thereof. Fig. 3 is an exploded View of the refrigeratorRefrigerating machines of the prlmary-secshown in Fig. 1 the lowerportion thereof being ondary type are particularly adapted for use inpartly cut away; and Fig; 4 is an enlarged exrefrigerators of the typedescribed. In refrigploded view, partly in section, of thearrangeerating machines of the primary-secondary type ment fortransferring heat between the primary a primary refrigerant circuit isprovided which and secondary refrigerant circuits included in includes aprimary evaporator supplied with liqthe refrigerating machine shown inFigs. l and 3. uid refrigerant from a suitable source or re- Referringto the drawings, in Fig. 1 I have frigerant circulating device of any ofthe wellshown a. refrigerator embodying my invention known types. Thesecondary refrigerant circuit including a smooth walled rectangularcabinet 25 also includes an evaporator. The refrigerant made up ofseparable upper and lower sections passages of the two refrigerantcircuitsvare not I0 and II respectively. The upper section I0 incommunication with each other, but portions of the cabinet is providedwith an outer sheet of the two refrigerant circuits are, however,armetal shell I2 and has a rectangular relatively ranged in heatexchange relationship, so that low temperature or freezing compartmentI3 30 the primary evaporator abstracts heat from the formed therein by arectangular sheet metal refrigerant contained in the secondaryrefrigliner I4. The side walls and top of the liner erant circuit.Because of the independence of Il are surrounded by heat insulation I5.A

the circulatory systems of the two refrigerant plate I 2a of insulatingmaterial provided with 5 circuits, it is possible to maintain theevaporaa cent l rectangular opening I2b forms the 35 tor contained ineach circuit at a different tembottom, f the upper cabinet section l0.The

perature from the other. The primary evaporalower sectIon II of thecabinet which supports tor may be conveniently utilized for cooling thethe upper section I 0 is provided with an outer freezing compartment andthe secondary evaprectangular relatively high temperature sheet oratormay be utilized 'for cooling the cooling or metal shell I6 and has arectangular cooling or 40 food storage compartment. food storagecompartment I1 formed therein It is an object of my invention to providea by a. rectangular sheet metal inner liner I8. The refrigeratingmachine of the primary-secondary 1side walls and bottom wall of theliner I8 are type having an improved arrangement for consurrounded byheat insulation I 9. The upper trolling the temperatures produced byeach of edge of the shell I6 is provided with an inturned 45 the severalevaporators included in the machine. peripheral flange 20 on which anadjacent in- It is a further object of my invention to proturned flange2| formed on the shell I2 rests. vide a refrigerator of the typedescribed in- .A recess 22 is formed in the flange 2I extending cludinga refrigerating machine of the primaryentirely about the same and arectangular rub- 30 secondary type having an improved arrangement bergasket 23 is mounted therein. 'I'he rubber 50 of the parts thereof whichis efficient in operagasket is rmly retained on the upper Surface tionand which is economical to manufacture. of the flange 20 by the weightof the upper sec- Another object of my invention is to provide tion I 0of the cabinet. An air-tight joint is a refrigerating machine having animproved arthus formed between the upper and lower secrangement forpreserving vegetables and similar tions of the cabinet and in that waythe ingress 55 oi air to the space between them is prevented. Itisdeslrable thus to exclude moisture-laden air from the space betweenthe walls of the cabinet containing insulation both to prevent theformation of frost therein and also to prevent the deposit of moisturein the insulation, because the insulation is usually made of some dryfibrous material the heat insulating properties of which are radicallyreduced when it absorbs a substantial amount of moisture. A pair of pins2|a provided in the flange 2| engage complementary holes 29a formed inthe flange 20 thus preventing lateral displacement of the upper .cabinetsection Ill with respect to the lower section The cabinet, describedabove, is provided with a primary-secondary type refrigerating machinein which the primary evaporator is utilized for cooling the freezingcompartment I3 and abstracting heat from the refrigerant in thesecondary circuit while the secondary evaporator is utilized for coolingthe cooling compartment I1. A refrigerant liquefying unit which suppliesliquid refrigerant to the primary evaporator is also mounted on theseparable top cabinet section I0.

'Ihe provision of a refrigerator including` a cabinet made up ofseparable upper and lower sections containing a freezing compartment anda cooling compartment, respectively, and also comprising aprimary-secondary type refrigerating machine for cooling saidcompartments is not my invention, but is the invention of ChristianSteenstrup and is described and claimed in his Patent No. 2,101,656,granted on December 7, 1937, and assigned to the General ElectricCompany, the assignee of my present invention. My present inventionrelates to an improved arrangement for controlling the temperature ofthe compartment cooled by the secondary evaporator, the ventilation ofthe refrigerator, and an improved heat exchange arrangement between theprimary and secondary circuits.

In the refrigerating machine illustrated, gaseous refrigerant, such assulphur dioxide, is compressed by a motor driven compressor contained ina hermetically sealed casing 24 and is supplied to an air cooledcondenser 25 which surrounds the casing 24, the condenser and casingbeing cooled by natural draft. Liqueed refrigerant is discharged fromthe condenser 25 through a conduit 26 and passes through a flowcontrolling float valve 21 to a conduit 28 through which it is suppliedto a primary evaporator 29, which is of the flooded type. The primaryevaporator 29 includes a cylindrical horizontal header 30 and a seriesof depending refrigerantcirculatory conduits 3|, which communicate attheir upper ends with the header 30 below the normal liquid leveltherein. The header 30 is maintained about half full of liquidrefrigerant, the refrigerant circulatory passages 3| thus beingmaintained flooded with liquid refrigerant. The refrigerant circulatorypassages 3| arev arranged in good thermal contact with the metallicinner liner I4 of the freezing compartment I3 and are distributed overthe surface thereof, so that the entire surface of the inner liner I4 ismaintained at a substantially uniform temperature. The liquidrefrigerant contained in the refrigerant circulatory passages 3| isvaporized by the abe sorption of heat from articles contained in thefreezing compartment I3, and also by the absorption of heat transferredthereto from the secondary evaporator, as hereinafter described. Thebubbles of vaporized refrigerant flow upwardly through the refrigerantcirculatory passages 3| of the primary evaporator 29 to the header 30thereof where they are collected above the Alevel of the liquidrefrigerant therein. I'he vaporized refrigerant collected in the header30 is returned to the refrigerant compressor in the casing 24 through asuction line 32, which is connected to the top of the header 30 andabove the level of the liquid refrigerant therein.

The secondary refrigerant circuit includes a condenser portion and anevaporator portion connected in closed series or orbital relation. Inthe refrigerating machine shown in the drawings, the evaporator portionof the secondary circuit is formed by a secondary evaporator 33 which isutilized to abstract heat from the cooling compartment I1. The secondaryrefrigerant evaporator 33 includes a horizontal U-shaped header 34 whichis circular in cross-section and extends about at least three side wallsof the cooling compartment I1. A plurality of depending U-shapedconduits 35 provide refrigerant circulatory passages communicating withthe header 34 below the normal liquid level therein. The refrigerantcirculatory conduits 35 are preferably soldered to the metallic liner I8to provide good thermal contact with theI exterior surfaces of the sideand rear walls of the liner I8 of the cooling compartment I1. 'I'herefrigerant circulatory conduitsv 35 are distributed over a sufficientportion of the side and rear walls of the liner I8 in order that theentire side and rear wall surfaces of the latter will be maintained at asubstantially uniform temperature. 'I'he secondary refrigerantcirculatory system also includes a secondary condenser 36, which ispositioned adjacent a rectangular opening |9a formed in the top of theinsulation I9. As best shown in Fig. 4, the secondary condenser 36includes a smooth top plate 31 made of flexible sheet metal and acorrugated lower sheet 36. The corrugations in the lower sheet 38cooperate with the smooth upper sheet 31 to 'define a refrigerantcirculatory passage in the condenser 36. The sheets 31 and 38 aresecuredtogether about their peripheral edges and along the contacting portionsthereof between the corrugations formed in the lower sheet 38 by linewelding, a series of closely spaced spot wclds, brazing, or in somesimilar manner. The secondary condenser 36 is supported on four helicalcompression springs 39 which are located adjacent the corners thereofand connected to the secondary evaporator 33 by iiexible conduits sothat there will be no interference withA the movement of the secondarycondenser 36 upon the helical compression springs 39. The lower endsofthe compression springs 39 rest on horizontal supports 49 and 4I whichare in turn secured at their opposite ends to the outer shell I6 of the'lower section of the cabinet.

A series of depending'I ribs 42 are provided on the lower side of theprimary evaporator 29 extending through a rectangular opening I5a.formed in the insulation I5 and the opening I 2b in the plate I2a, inorder to conduct heat from the secondary evaporator 36 to therefrigerant contained in the circulatory passages 3| of the primaryevaporator 29. The depending ribs 42 are preferably made of cast iron,or some good heat conducting material, and in the refrigeratorillustrated are cast on the lower portions of the refrigerant passages3| of the primary evaporator 23. A good thermal contact between the ribs42 and the refrigerant circulatory passages 3| is thus insured.

The lower surfaces of the ribs 42 are so positiofied-\that the springs33 are partially compressed] when the upper section I of the cabinet isplaced on top of the lower section II. As a consequence, the heatconducting ribs 42v are pressed into good thermal contact with the uppersurface of the secondary condenser 38. Since the sheet 31 which formsthe upper surface of the secondary condenser 36 is flexible, it willclosely conform to any irregularities in the lower surfaces of the heatconducting ribs 42.

'Ihe secondary evaporator 33 is of the flooded type and the header 34thereof is normally maintained about half full of liquid refrigerant,the circulatory passages 35 thereof being thus maintained iiooded. Theliquid refrigerant contained in the refrigerant circulatory passages 35is vaporized by the absorption of heat from the cooling compartment I1and the bubbles of vaporized refrigerant pass upwardly through thecirculatory passages 35 to the header 34 where the vaporized refrigerantis collected above the level of the liquid refrigerant containedtherein. 'Ihe vaporized refrigerant collected in the header 34 passesthrough ,a flexible conduit 43. which is connected to the top of theheader'34 above the normal liquid level therein, into the circulatQ-ypassages of the secondary condenser 3B. The gaseous refrigerant thuspassing to the secondary condenser 36 is liquefied therein by thetransfer of heat therefrom through theribs 42 to the primary evaporator29. 'I'he secondary condenser 36 is placed at an angle, as illustratedin the drawings, in order that the refrigerant liquefled therein willdrain by gravity to the lower end thereof at which an outlet 44 islocated. Liquid refrigerant passes from the outlet 44 through a flexibleconduit 45 to control valve 46, described more in detail below, and thenthrough a conduit 41 back to the header 34 of the secondary evaporator33. The secondary evaporator 33 and secondary condenser 36 are thusconnected in orbital, or closed series relation.

compartment I1 are lprovidedwith openings 48 and 49 which are closed byheat insulated doors SUIand 5I, respectively. Articles to be preservedin the respective compartments may be inserted through these openings. Aseries of wire shelves l2 are supportedv within the cooling compartmentI'I or inwardly projecting shoulders 53 formed in the side walls of theinner liner I8. Trays of water to be frozen, ingredients'for ice cream,or the like, may be placed in the freezing compartment I3, as well asmeat and similar articles which are best preserved at temperatures below32 F. 'Ihe primary evaporator 29 ordinarily maintains the freezingcompartment I3 temperature below 32 F.usually within the range from 0 to10 F. Bottles of milk, vegetables, or the like, may be preserved in thecooling compartment I'I at a temperature above 32 F. and below 50 F. Ihave found 40 F. to be a desirable average temperature for the air inthe cooling compartment I1., It will be noted that the secondaryevaporator 33 cools the side and rear walls of the rliner I3 to asubstantially uniform temperature,

thus providing a cooling surface of relatively large coolingrcompartment I1.

through the insulation I9 toward the compartment I1. Thus, it ispossible to cool the contents of the compartment I1 with a relativelysmall The freezing compartment I3 and the coolingk atav properpreservation since dehydration is one of y the principal causes of theirwilting and taking on an unpalatable appearance. The problem oflmaintaining a small temperature differential between the evaporator andthe air in the compartment is particularly important in an arrangementin which fresh air is continually admitted to the compartment ashereinafter described.

In the refrigerator shown in the drawings, the primary evaporator 29Y isalso provided witha relatively large cooling area in proportion to thecubic contents of the freezing chamber I3 in,

orderto reduce the-frosting of the walls thereof. That is, if a xed rateof dehydration is assumed, the thickness of the layer of frost formed onthe evaporator will be inversely proportional to its area; It isdesirable that the thickness of the frost layer be minimized as thefrost obstructs lthe passage of heat from the air in the compartment tothe refrigerant contained in the evaporator.

The amount of liquid refrigerant contained in each of the evaporatorsmay-be properly proportioned in order to aid in maintaining the desireddifferential in temperature between the freezing compartment I3 and thecooling compartment I'I, respectively. If sulphur dioxide, for example,is used'as the refrigerant in both evaporators the amount of liquidrefrigerant in the secondary evaporator 33 may be proportioned withrespect to its total volume in such manner that onlythe lower portionsof the conduits 35 are filled with liquid refrigerant. Since theportionof the evaporator 33 containing liquid refrigerant performs the majorpart of the cooling and this portion of the evaporator is decreased asthe amount of liquid refrigerant in the evaporator is decreased, thetotal amount of heat dissipated from the cooling compartment I1 isdecreased and the average temperature prevailing in the coolingcompartment is increased. Even when the quantity of refrigerant in thetwo evaporators are proportioned, as described above in order tomaintain the desired differential in temperature between the freezingcompartment I3 and the cooling .compartment Il, I have found that thereis an undesirable interdependence between the temperatures prevailing inthese two compartments. That is, when the primary evaporator 29 issubjected to a heavy load due to warm meat, or the like, being placed inthe freezing compartment I3, the amount of heat abstracted from therefrigerant contained in the secondary refrigerant circuit is loweredand, as a conseqeunce, the temperature in the cooling compartment IIrises.

' I have provided an arrangement for regulating the temperature of thecontents of the cooling compartment I1 irrespective of the temperatureprevailing in the freezing compartment I3. This arrangement includes thecontrol valve 46 which regulates the amount of liquid refrigerantflowing to the flooded type secondary evaporator 33 from the secondarycondenser in order to v the bellows 59.

maintain the contents of the cooling compartment I1 at a relativelyconstant temperature. As best shown in Fig. 2l the control' valve 46includes a cylindrical valve casing 54 having a cylindrical valveseating member 55 rigidly secured in one end thereof. The valve 46 is`mounted on the support 4| by a bracket 54a. A valve seat 56 is formed inthe Valve seat member 55 which cooperates with a cylindrical valveelement 51 to control the amount of liquid refrigerant ilowing from theconduit 45 through the recess 58 formed in the valve seat member 55 tothe conduit 41. vThe butt end of the valve element 51 is rigidly securedto a closed outer end of a flexible metallic bellows 59C The oppositeend of the bellows 59 is hermetically sealed to th'e valve seat body 55.The valve element 51 is loosely mounted in a guide bushing 60 which-isrigidly secured in a bore formed in the valve seat member 55communicating with the recess 58 therein. Liquid or gaseous refrigerantentering the recess 58 from the conduit 45 passes along the groove 51ain the side of the valve element 51 into the interior of the bellows 59.The exterior of the bellows 59 is exposed to atmospheric pressure andwhen the pressure of the refrigerant contained within the bellowsreaches a predetermined value, the bellows is expanded and the valveelement 51 retracted from the seat 56, so that liquid refrigerant ispermitted to flow past the seat 56 from the conduit 45 into the conduit41. The pressure of the gaseous refrigerant in the secondary evaporator33 is transmitted to the liquid refrigerant contained in the secondarycondenser 36 since they are in open communication through the conduit 43and this pressure is in turn communicated through the refrigerant in theconduit 45 and valve 46 to the interior of In consequence, the valveelement 51 is caused to move from a closed to an open position when thepressure and hence the temperature of the secondary evaporator 33reaches a predetermined value, thus admitting additional liquidrefrigerant thereto. .When the secondary evaporator 33 reaches apredetermined low value, the pressure therein drops to a correspondingvalue and the valve element 51 again closes thus shutting off the flowof liquid refrigerant to the secondary evaporator 33. When the valveelement 51 is closed liquid refrigerant is accumulated in the secondarycondenser 36 and as the condenser fills with liquid, the amount of heat'transferred therefrom to the primary evapy orator 29 decreases. 'Iheaccumulation of liquid refrigerant in the secondary condenser 36decreases the heat transfer to the primary evaporator 29 which raisesthe vapor pressure in the secondary refrigerant circuit thus minimizingthe evaporation of refrigerant in the the secondary evaporator 33 andconsequently raising the temperature thereof. When the pressure in thesecondary refrigerant circuit reaches a predetermined high value thevalve element 51 again moves to the open position, as described above,

admitting liquid refrigerant to the secondary evaporator 33.

The temperature at which the bellows 59 will cause the valve element 51to open and close the valve may be regulated from the exterior of thecabinet by a rotatable operating button 6|, which is rigidly connectedto a rod 62 by a coupling 63. The inner end of the rod 62 is connectedto a threaded plug 64 by a screw 65. The plug 64 is threaded in abushing 66 which is rigidly secured in the end of the valve casing 54.'I'he inner end of the plug 64 is provided with a bore 61 in which ahelical compression spring' 68 is mounted. The compression spring 68bears against a disk '69 rigidly secured to the end of the bellows 59.The position of the, plug 64 in the bushing 66 and hence the biasingforce exerted by the spring 68 on the bellows 59 may be varied byrotating the operating button 6I. As a consequence, the pressure atwhich the valve element 51 operates may be adjusted in this manner, toobtain the desired temperature in the compartment I1.

It is often desirable to preserve butter or similar articles at atemperature above 40 F. but somewhat below room temperature. It isdesirable to preserve butter at this higher temperature in order that itwill not become too hard for spreading. I have provided a buttercompartment 10 within the cooling compartment I1 which includes acup-shaped shell 1I having spaced sheet metal walls separated by heatinsulation 12. The outer wall of the sheet metal shell 1| is welded, orotherwise rigidly secured, to the liner I8 of the cooling compartmentI1, the open front side of the butter compartment 10 being closelyadjacent the rear side of the door 5|. A fresh air inlet 13 is providedin the side of the butter compartment 10 which communicates with theexterior of the lower cabinet section Fresh air may thus enter thebutter compartment 19 through the air inlet 13 and after passingtherethrough flows through the openfront of the butter compartment intothe cooling compartment I1. An air outlet is provided in the lower, rearwall of the compartment I1 by a conduit 14 which is provided with abushing 15 at its inner'l and below the ambient temperature of the sur-4rounding air. The warm airiowing from the butter compartment 10into-,the cooling-compartment I1 is cooled thereinand the cold air inthecooling .compartment 1I1,' settlesl toA they bottom thereof from whichit passes outwardly through the outlet conduit14..` Freshair is thuscontinually supplied to the :interior ofthe cooling compartment |1,which aids in Ain aintainingthe relative humidity of the aircontainedthereinfat a relatively high value, that is, about I%andgdehydration of the .contents is minimized. Such ventilation of thecoolingcompartment also .pre-k vents the same frombecoming odoriferousinthat the-gases given off by articles being preserved are carried out ofthe compartment.r The removal of such gases also inhibits thedecomposition process. Since the circulation of the fresh air throughthe cooling compartment |1 is carried on through a rather tortuouscircuit, rst through the butter compartment 1D and then through thecooling compartment I1. and only under the influence of convection, theheat loss from the cold air passing through the outletl conduit 14 isnot very great.

While I have shown a particular embodiment of my invention in connectionwith a compression type refrigerating machine, Ido not desire myinvention to be limited to the particular construction shown anddescribed and I intend, in the appended claims, to coverallmodiflcations within the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

1. A refrigerator comprising a plurality of separable heat insulatedcabinet sections provided with communicating openings in their adjacentwalls, one of said cabinet sections having a freezing compartmenttherein, means including a primary evaporator forcooling said freezingcompartment, said primary evaporator extending adjacent said opening insaid one cabinet section,

another of said cabinet sections having a cooling compartment therein,means including a secondary evaporator for cooling said coolingcompartment, a secondary condenser, means for connecting said secondarycondenser in closed series relationship with said secondary evaporator,and means for resiliently supporting said secondary condenser adjacentsaid opening in said last mentioned cabinet section in heat exchangerelaytionship with the-portion -of said primary evaporator adjacent saidopening in said one cabinet section.

2. A refrigerator comprising a plurality of separable heat insulatedcabinet sections provided with communicating openings in their adjacentwalls, one of said cabinet sections having a freezing compartmenttherein, means including a primary evaporator for cooling said freezingcompartment, said primary evaporator extending adjacent said opening insaid one cabinet section, another of said cabinet sections having acooling compartment therein, means including a secondary evaporator forcooling said cooling compartment, a secondary condenser, means forconnecting said secondary condenser in orbital relationship with -saidsecondary evaporator, and means including a plurality of compressionsprings bearing against the one side of said secondary condenser forresiliently supporting the same adjacent said opening in said lastmentioned cabinet section in heat exchange relationship with the portionof said primary evaporator adjacent said opening in said one cabinetsection.

3. A refrigerator comprising a plurality of separable heat insulatedcabinet sections provided with communicating openings in their adjacentwalls, one of said cabinet sections having a freezing .compartmenttherein, means including a primary evaporator for cooling` said freezingccmpartment, said primary evaporator extending adjacent said opening insaid one cabinet section,

4. A refrigerator comprising a plurality of sep-`` arable heat insulatedcabinet sections provided with communicating openings in their adjacentWalls, one of said cabinet sections having a freezing compartmenttherein, means including a primary evaporator for cooling said freezingcompartment, said primary evaporator being provided with a series ofheat conducting ribs extending through said opening lin said one cabinetsection, another of said cabinet sections having a cooling compartmenttherein, means including a secondary evaporator for cooling said coolingcompartment, a secondary condenser, means for connecting said secondarycondenser in closed series relationship with said secondary evaporator,said secondary condenser having a flat upper surface of resilient sheetmetal, and means for resiliently supporting said secondary condenseradjacent said opening in said last mentioned cabinet section in aposition in which said upper surface of said secondary condenser is inthermal contact with said ribs on said primary evaporator.

5. A refrigerator comprising a plurality of separable heat insulatedcabinet sections provided with communicating openings in their adjacentwalls, one of said cabinet sections having a freezing compartmenttherein, means including a primary evaporator for cooling said freezingcompartment, said primary evaporator being provided with heat conductingribs extending through said opening in said one cabinet section, anotherof said cabinet sections having a cooling compartment therein, meansincluding a secondary evaporator for cooling said cooling compartment, asecondary condenser, means for connecting said secondary condenser inclosed series relationship with said secondary evaporator, and means forresiliently supporting said secondary condenser adjacent said opening inthe last mentioned cabinet section in heat exchange relationship withsaid ribs on said primary evaporator.

6. A refrigerator comprising a heat insulated cabinet section havingafreezing compartmentA therein, means including a primary evaporator forcooling said freezing compartment, a second heat insulated cabinetsection having a cooling compartment therein, means including asecondary evaporator for cooling said cooling compartment, said firstmentioned cabinet section being mounted on top of said second cabinetsection, each of said cabinet sections having an opening in one wallcommunicating with an opening in the adjacent wall of the other section,a secondary condenser, means for connecting said secondary condenser inclosed series relationship to said secondary evaporator, and means forresiliently supporting said secondary condenser adjacent said opening insaid second cabinet section in heat exchange relationship with a portionof said primary evaporator adjacent said opening in said iirst mentionedcabinet section.

7. A refrigerator comprising a plurality of separable superimposed heatinsulated cabinet sections provided with communicating openings in theiradjacent walls, one of said cabinet sections having a freezingcompartment therein, means including a primary evaporator for coolingsaid freezing compartment, said primary evaporator extending adjacentsaid opening in said one cabinet section, another of said cabinetsections having a cooling compartment therein, means including asecondary evaporator including a header extending about at least threewalls of said cooling compartment and depending refrigerant circulatorypassages communicating therewith for cooling said cooling compartment, asecondary condenser, means for connecting said secondary condenser inclosed series relationship with said secondary evaporator, saidsecondary condenser being located adjacent said opening in said 'secondcabinet section in heat exchange relationship with the portion of saidprimary evapy ter cooling compartment to said iirst mentioned coolingcompartmentand means including an air inlet in a wall of said buttercooling comparte ment and an air outlet in a wall of said firstmentioned compartment for Ventilating both of said cooling compartments.

9. A refrigerator comprising a plurality of separable heat insulatedcabinet sections provided with communicating openings in heir adjacentwalls, one of said cabinet sections having a relatively low temperaturecompartment therein, means including a primary evaporator for coolingsaid relatively low temperature compartment, said primary evaporatorextending adjacent said opening in said one cabinet section, another ofsaid cabinet sections having a relatively high temperature compartmenttherein, means including a. secondary evaporator for cooling saidrelatively high temperature compartment, a secondary condenser, meansfor'connecting said secondary condenser in closed series relationshipwith said secondary evaporator, and means for resiliently supportingsaid secondary condenser adjacent said opening in said last-mentionedcabinet section in heat exchange relationship with the portion of saidprimary evaporator adjacent said opening in said one cabinet section.

10. A refrigerator comprising a plurality of separable heat insulatedcabinet sections provided with communicating openings in their adjacentWalls, one of said cabinet sections having a relatively low temperaturecompartment therein, means including a primary evaporator for coolingsaid relatively low temperature compartment, said primary evaporatorextending. adjacent said opening in said one cabinet section, another ofsaid cabinet sections having a relatively high temperature compartmenttherein, means including a secondary evaporator for cooling saidrelatively high temperature compartment, a secondary condenser, meansfor connecting said secondary condenser in closed series relationshipwith said secondary evaporator, means for resiliently supporting saidsecondary condenser adjacent said opening in said last-mentioned cabinetsection in heat exchange relationship with the portion of said primaryevaporator adjacent said opening in said one cabinet section, and meansincluding an automatic valve responsive to the pressure in saidsecondary evaporator for controlling the flow of refrigerant from saidsecondary condenser to said secondary evaporator.

HARLEY H. Burma.

